I'm just trying to get information on what type of competitions existed in the mid 90's to 2000 and what the point systems and such were like so I can make this legit when I write about it. I don't know why I'm getting insulted just for asking in a martial arts community who has the knowledge of this, with remarks on whether I can write or not.
The direct answer to this is-there wasn't one type of competition that existed in that time period. This would be similar to asking "What type of restaurants existed in the 90s" because you're writing a book about a cook.
To make it realistic, you don't need to worry about the type of restaurant. You would need to work in a kitchen to have a baseline of experience, and then write based on that experience. That's where the realism comes from, not whether or not there were more sushi or italian restaurants in california in 1995.
Similarly, it doesn't matter what type of tournament you base it on. A similar tournament was bound to exist then. Just find a tournament/style that interests you in terms of writing, train for a bit so you understand what that's like, and then participate in a similar tournament so you understand what that's like, and you'll develop realism from there. If for whatever reason you're not able to do that, find current tournaments, go to some of them, and write down your observations. Again, the type doesn't matter for realism, capturing what happens there, how it happens, and people's emotions in the place does.
After that, if you want to know what's changed since then, let's say you choose kyokushin tournaments. If you want to know about rule changes or changes in strategies that occurred since the 90s, once you know the modern strategies, you can ask about those to get those aspects correct. But just a general "Were there teen martial arts tournaments in the 90s and 2000s" question isn't designed to get you a productive answer.
